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(First upload on May 16 2013. Last on July 22 2023) [ 日本語 | English ]

Imperata Cirillo (チガヤ) One species in Japan (ca 10 species in the world) Chigaya (チガヤ, 茅/茅萱), blady grass, cogon grass, and others Life form: weedy perennial grass < 60 cm high Distribution: E/S Africa - India - east and southeast Asia (south to southwestern Hokkaido) - Micronesia - Australia Habitat: open spaces, grasslands The grassland is maintained by human disturbances (人為撹乱), such as mowing and prescribed fire (野焼)

Seed dispersal: wind Synonyms: Imperata cylindrica (L.) Raeusch. var. major (Nees) C. E. Hubb. Imperata koenigii (Retz.) P. Beauv. Imperata cylindrica (L.) Raeusch. ssp. koenigii (Retz.) Masam. et Yanagihara var. cylindrica (ケナシチガヤ), the type var. koenigii (Retz.) Pilg. (チガヤ)

Imperata cylindrica in Japan

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[1-3] at West Ariake Pier Park, Tokyo, on May 12 2013.
4 5 6
[4] on a roadside near The Great Road Cut, Izu-Oshima Island (伊豆大島), on June 7 2023. [5/6] close to Oi Pier Seaside Park, Tokyo, on June 3 2016.

cv. rubra (ベニチガヤ)

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[1-3] along a paved street near Keidanren Building, Chiyoda Ward, Tokyo, on June 7 2019.